Half double crochet is in between the height of single crochet and double crochet, and it is made using aspects of both. It is abbreviated hdc.
Step 1
Yarn over and insert the hook into the work (third chain from hook on the starting chain).

Step 2
* Yarn over and draw through pulling up a loop.

Step 3
Yarn over again and pull yarn through all three loops on the hook.

Step 4
One half-double crochet made. Yarn over, insert hook into next stitch; repeat from * in step 2.
